#!/bin/bash
print_error_info(){
    cat <<ERROR_EOF
error !
use option h to get help infomation
ERROR_EOF
}
st=0
while getopts "s:p:h" OPT
do
    case $OPT in
    s)
    st=$OPTARG
    ;;
    p)
    path=$OPTARG
    ;;
    h)
    cat <<HELP_EOF
DESCRIPTION
    This script changes the name of files under directory specified by option p to continuous number which starts from
a number specified by option s. The extension name of the file won't be changed

OPTIONS
    -s
        specify the initiating number
    -p
        specify the directory in which files that will be changed reside
    -h
        output this help document
HELP_EOF
    exit 0
    ;;
    esac
done
if [ -z "$path" ] ; then
    print_error_info
    exit 1
fi
cnt=0
find "$path" -maxdepth 1 -type f  | while read line
do  # www.jquerycn.cn
    name=$(basename $line)
    echo $line
    if [ $(echo $name | awk '{ print match($0, "\."); }') -eq "0" ]; then
        name="$cnt"
    else
        name="$cnt"."$(echo $name | awk -F . '{ print $NF }')"
    fi
    name="$(dirname $line)"/$name
    mv $line $name
    let "cnt=$cnt+1"
done